Time of last injection indicator for medication delivery pen

Abstract

A medication delivery pen is provided with an indicator that displays the time of last injection through interaction between a cap and pen body assembly. When a user requires an injection the cap is removed from the pen and a dose is set by turning a dose setting knob to the desired dose as displayed in a window in the pen. After the desired dose is set using the dose setting knob, injection is achieved by pushing an actuator button. After injection the user replaces the cap on the pen such that indicia on the cap align with indicia on the body of the pen to display the day and time of day of the last injection, thereby providing the user with means for remembering when the last injection was administered by aligning indicia on the cap with indicia on the pen body assembly, without having to otherwise write or record the day and time of the last injection.

What is claimed is: 
     
       1. A medication delivery pen comprising: a pen body assembly comprising a distal end, a proximal end, means for setting a desired dose of medication to be dispensed by said pen body assembly and means for dispensing the desired dose of medication from the distal end of said pen body assembly, said pen body assembly including a plurality of indicia thereon;   a cap for covering said distal end of said pen body assembly, said cap having an indicia thereon; and   means integral with and on said pen body assembly and said cap for indicating when the desired dose of medication was dispensed from said pen body assembly when said cap is attached to the distal end of said pen body assembly, wherein said indicating means is interposed between said distal end and said proximal end of said pen body assembly when said cap covers said distal end of said pen body assembly,   wherein each of said plurality of indicia on said pen body assembly represent a day of a week, whereby said indicating means display the day of the week the desired dose was dispensed, when said cap is attached to the distal end of said pen body assembly, and   wherein said indicia on said cap comprises an AM indicia and a PM indicia, whereby one of said cap indicia can be aligned with one of said plurality of indicia on said pen body assembly for said indicating means to display a time of day and the day of the week the desired dose was dispensed, when said cap is attached to the distal end of said pen body assembly.   
     
     
       2. The medication delivery pen of claim 1, wherein said means for indicating when the desired dose of medication was dispensed from said pen body assembly comprises a tactile display located on said cap and said pen body assembly. 
     
     
       3. The medication delivery pen of claim 1, wherein said means for indicating when the desired dose of medication was dispensed from said pen body assembly comprises a visual display located on said cap and said pen body assembly. 
     
     
       4. The medication delivery pen of claim 1, wherein said cap further comprises a protrusion extending into said cap and said pen body assembly further comprises a cartridge holder assembly at the distal end having a housing with a pair of tabs defining a receiving port for receiving said protrusion on said cap to prevent rotation of said cap on said pen body assembly when said cap is attached to the distal end of said pen body assembly. 
     
     
       5. The medication delivery pen of claim 1, wherein said means for dispensing the desired dose includes an actuator button rotatably mounted on the proximal end of said pen body assembly. 
     
     
       6. The medication delivery pen of claim 1, wherein said means for setting the desired dose of medication to be dispensed by said pen body assembly includes a dose setting knob rotatably mounted to the proximal end of said pen body assembly, wherein rotation of said dose setting knob causes said dose setting knob to telescope out of the proximal end of said pen body assembly. 
     
     
       7. A medication delivery pen comprising: a pen body assembly comprising a distal end, a proximal end, means for setting a desired dose of medication to be dispensed by said pen body assembly, means for dispensing the desired dose of medication from said distal end of said pen body assembly, and a plurality of indicia representing particular days of a week;   a cap for covering said distal end of said pen body assembly having a plurality of indicia, each of said indicia representing a predetermined time of day; and   means integral with and on said pen body assembly and said cap for indicating when the desired dose of medication was dispensed from said pen body assembly provided by aligning one of said time of day indicia on said cap with one of said plurality of day of the week indicia on said pen body assembly when said cap is attached to said distal end of said pen body assembly,   wherein said indicating means is interposed between said distal end and said proximal end of said pen body assembly when said cap is attached to said distal end of said pen body assembly.